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How Much Does It Cost to Service or Repair a Boiler? [2025 Data]
Normal Range: $190 - $659
Boiler service costs run about $424 on average, but can cost between $190 and $659 depending on the type of repair.
How we get this data
Photo: Courtesy of Angi member David B. of Dedham, Massachusetts
Photo: Courtesy of Angi member David B. of Dedham, Massachusetts
Cost Insights
Basic boiler repairs can cost around $100, but repairs for major issues can cost up to $1,000.
If your boiler is working fine, you should still prepare to budget $200 to $500 for annual servicing.
The cost to service a boiler depends on the type. For instance, a gas boiler can cost $100 to $400 to service, whereas an oil boiler can cost between $200 and $500.
If your boiler just needs individual parts service, you can have them fixed, but it might cost less to replace the boiler in full. Some parts, like the transformer, can cost up to $500 to be replaced.
Boiler service costs average around $424. However, boiler servicing could run between $190 and $659, depending on type, replacement parts, and the cause of the problem. We’ll explain how to estimate your boiler repair cost in this guide.
How Much Does It Cost to Service or Repair a Boiler?
A simple boiler repair starts at $100, but major issues can cost around $1,100, depending on what’s wrong with your boiler.
Service
Even if your boiler is working fine, you should plan on spending between $200 and $500 for an annual boiler servicing. Routine checks are the best way to catch any issues early on and ensure that your boiler system is in tip-top shape.
During a routine service, the tech will:
Clean the unit, which may include a flush
Check for common issues like leaks and low water levels
Descale hard water
Replace parts that are prone to wear and tear
Conduct repairs
You can pay individually for different services rather than opt for an annual service contract, in which case you could expect to pay the following:
Annual inspection: $200–$400
Routine maintenance: $150–$400
Service call for repair: $75–$250
Boiler cleaning or descaling: $150–$350
Hourly rates for service and repair: $45–$200
Average repair costs: $150–$750
How Much Does Boiler Repair Cost by Type?
The cost of your boiler repair can vary widely depending on your boiler type: gas, electric, or oil. Boilers usually last 15 to 20 years, so if it’s more than 15 years old, your money is probably best spent on a new boiler rather than repairing your current unit.
| Boiler by Fuel Source | Average Cost Range for Repairs |
|---|---|
| Gas Boiler | $100–$400 |
| Electric Boiler | $200–$450 |
| Oil Boiler | $200–$500 |
Repair Cost by Part
Some repairs—like replacing the coil, circulating pump, or gas valve—can cost over $1,000. In these cases, it’s a good idea to weigh the pros and cons of purchasing a new unit instead of completing the repairs, especially if your boiler is near the end of its useful life.
| Boiler Replacement Part | Average Cost Range (Including Labor) | Boiler Part Function |
|---|---|---|
| Radiator Valve | $180–$330 | Controls how much hot water goes into each radiator |
| Transformer | $180–$500 | Supplies power to boiler |
| Zone Valve | $200–$500 | Controls flow of water and steam |
| Fan | $200–$500 | Pushes combustion fumes outside through flue |
| Expansion Tank – Electric | $200–$550 | Provides cushion for expanding water when heated |
| Expansion Tank – Gas | $200–$550 | Provides cushion for expanding water when heated |
| Expansion Tank – Oil | $250–$530 | Provides cushion for expanding water when heated |
| Flue | $300–$700 | Carries combustion fumes outside of home |
| Circulating Pump | $300–$1,000 | Pumps heated water through house |
| Gas Valve | $300–$1,100 | Controls flow of gas to burner |
| Coil | $500–$1,000 | Transfers heat from burner to water |
Repair Cost by Common Issues
Here are some common boiler issues to help you estimate the cost of repairs.
Leaks, Strange Noises, and Unreliable Heat
A frequent boiler issue is a mineral deposit buildup. Your professional can remedy it with a power or chemical flush, which requires using hot water and chemicals at a high pressure to flush the system, while chemical flushes rely on chemical products rather than pressure to get the job done.
| Boiler Problem | Solution | Cost to Repair |
|---|---|---|
| Leak around boiler unit | Replace frozen condensate line, faulty expansion tank, or faulty valves, pipes, or seals | $140–$750 |
| Strange noises from boiler | Replace heat exchanger | $1,000–$2,000 |
| Unreliable heat | Power flush | $200–$600 |
Boiler Turns Off Unexpectedly
If you turn on your boiler but it turns itself off, you may be dealing with a broken thermostat, faulty pipes, valves, circulator pipes, or low pressure. Repairs run from $250 to $1,000, depending on the underlying issue.
Boiler Won’t Turn On
If your boiler won’t turn on at all, then you may be dealing with a variety of possible issues. For one, it could be a tripped circuit breaker or a bad fuse. These are the simplest issues to fix, and they usually cost around $75 if you need to call in an electrician. It may also be a faulty thermostat, frozen condensate pipe, clogged fuel line, or low pressure. You might be able to fix the frozen pipe by pouring hot water on it, but if the issues are stemming from somewhere else, you may need to spend about $270 to $1,800 to fix the problem.
Boiler Has No Water Pressure
Repairing a boiler with no water pressure can cost approximately $200 to $1,000. The best-case scenario is that you need to fix a water leak, although the issue could be faulty pipes, valves, or a malfunctioning circulating pump.
| Boiler Repair Problem | Average Cost Range for Material | Average Cost Range for Labor |
|---|---|---|
| Ignitor Switch | $25 – $150 | $100 – $200 |
| Faulty Expansion Tank | $40 – $130 | $100 – $250 |
| Faulty Circulator, Ductwork, Radiators | $150 – $350 | $250 – $500 |
| Faulty Pipes, Valves, or Circulator | $150 – $400 | $200 – $600 |
Boiler Servicing and Repair Cost Breakdown
The costs associated with boiler servicing and repair are straightforward: You’ll need to pay for parts and labor. If your boiler is under warranty, there’s a good chance you won’t have to pay for parts. However, labor still makes up the majority of your boiler repair costs in most cases.
Parts
The individual parts for boiler repair can be as little as $10 or as much as $800. Often, a single repair can require multiple parts, so your total for parts could be higher. And generally speaking, it’s easier to find parts for gas boilers rather than electric or oil boilers, as they are the most prevalent type of boiler.
Labor
Techs usually charge for labor with a flat fee of $150 to $300 or with an hourly rate of $75 to $130 per hour. Expect to pay more if you need emergency service or after-hour help. Weekends and holidays tend to fetch the highest labor costs to account for the inconvenience. On the other hand, you’re likely to get better labor rates during regular maintenance servicing.
Size
The British thermal unit (BTU) of your boiler isn’t going to change the cost of service or repair dramatically, as the components and labor generally cost about the same regardless of the boiler capacity. However, the size of your boiler will have a big impact on the costs of boiler installation, should a replacement be necessary.
For example, a 1,000-square-foot home likely needs a 30,000 to 45,000 BTU boiler that costs about $4,000 to $6,200, while a 2,500-square-foot home needs a 75,000 to 113,000 BTU boiler that ranges between $5,600 and $8,600.
Why You Should Hire a Boiler Repair Pro
Boilers are complicated appliances. Diagnosing issues such as heat loss, unusual noises, or pressure problems requires expertise that most homeowners lack, and incorrect assumptions about the situation often lead to more extensive repairs and higher energy bills. A qualified local boiler tech can quickly pinpoint issues and keep your system running safely.
Here’s why it’s ideal to hire a boiler repair pro
Boilers involve heat, pressure, and fuel lines, so hiring a pro ensures the job is done correctly by:
Identifying whether the issue is a minor repair or a sign of a failing system
Testing pressure levels and safety controls accurately
Servicing burners, pumps, and valves without creating new problems
Flushing mineral buildup that causes leaks or unreliable heat
Matching replacement parts to your specific boiler type
Reducing the risk of leaking carbon monoxide and system damage
If you want to DIY a boiler repair
Only light maintenance and prep are safe to DIY. Here’s what you can take care of before your technician arrives:
Look up your boiler model number and age to help your pro diagnose faster
Clear clutter around the boiler for safer access
Inspect visible pipes for moisture or drips and share with the tech
Tips to Reduce Cost While Repairing or Servicing Your Boiler
Follow these tips and tricks to lower your boiler repair costs.
Hire a boiler technician during early spring for off-season pricing
Ask about discounts for signing annual service contracts
Check your boiler warranty and homeowner’s insurance for coverage
Schedule annual boiler service to avoid major issues
Next Steps: Finalize Your Project With a Pro
Know your boiler’s age, fuel type, and model number so the tech can provide a more accurate quote.
Ask if your symptoms suggest a simple fix (around $100) or a bigger repair (up to $1,000+), and why.
Confirm what’s included in the estimate, like service call fees, flat-rate vs. hourly labor, parts, and any add-ons.
Get a price range for the likely fix and what it could cost if additional issues are uncovered.
Ask if annual servicing makes sense for your boiler and what the appointment typically includes.
How Angi Gets Its Cost Data
Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We’ve surveyed thousands of real Angi customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects.
Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.
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